普陀山主要植物种生态位特征

利用样地调查方法,以物种重要值作为资源状态指标,应用Levins生态位宽度公式和Levins生态位重叠公式对普陀山主要植物种进行了生态位宽度和生态位重叠计算。结果表明:普陀山主要植物群落中,青冈(Cyclobalanopsis glauca)、茶(Camellia sinensis)、薹草(Carex tristachya)的生态位宽度分别在乔、灌、草本层中占有优势地位;而且,各层植物种之间有着不同程度的重叠,表现为草本层>乔木层>灌木层;总体上,各植物种的生态位重叠较小,生态位分化明显,资源利用方式分化较大;分布频度是影响植物种生态位宽度、生态位重叠大小的主要因素之一,分布频度越大,则生态位宽度越大,与其他植物种形成生态位重叠的机率也越大。

Niche characteristics of main plant species in Putuo Mountain, Zhejiang Province of East China

By the method of sampling plot investigation and using the importance value of plant species as an indicator of resource status, this paper studied the niche breadth and niche overlap of the main plant species in Putuo Mountain, based on the calculations with the Levins niche breadth and niche overlap formulae. In the main plant communities in the Mountain, Cyclobalanopsis glauca, Camellia sinensis, and Carex tristachya had the largest niche breadth in the tree, shrub, and herb layers, respectively. There existed different degrees of niche overlap among the plant species in different layers, being the largest in herb layer, followed by in tree layer, and in shrub layer. Overall, the niche overlap among the plant species was small, with an evident niche differentiation and a larger differentiation in resource use ways. Distribution frequency was one of the major factors affecting the plant species niche breadth and niche overlap. The larger the distribution frequency, the larger the plant species niche breadth and the probability of the formation of the plant species niche overlap.